Remote control of electrical devices



May 28, 19350 H. R. MALLORY ET AL REMOTE CONTROL OF ELECT RICAL DEVICESFiled Oct. 12, 1933 2 Sheets-Sheet l INVENTORS I? WE 2 Sheets-Sheet 2 H.R. MALLORY ET Al.

REMOTE CONTROL OF ELECTRICAL DEVICES Filed Oct. 12, 1933 May 28, 1935.

IfINVENTQRS YW M Wm? ATTORNEYS Patented May 28, 1935 Y UNITED STATESREMOTE CONTROL OF ELECTRICAL DEVICES Henry Rogers Mallory, Rye, andSamuel Ruben, New Rochelle, N. Y., said Rubenassignor to said MalloryApplication October 12, 1933, Serial No. 693,251

14 Claims.

The present invention relates to systems for and a method oftransferring radio frequency currents and the remote control ofelectrical devices with the use of residence lighting conductors and,more particularly, to a method of and system for the remote control ofthe amplifier and asso ciated speaker unit of a radio receiver whereinresidence lighting conductors are used as the sole connection betweenthe tuner unit and the amplifier and associated speaker unit.

General objects of the invention are the provisions of systems for andmethods of transferring the radio frequency currents and controlcurrents for remote control devices with the use of residence lightingconductors which are efficient in operation and make possible convenientlocation of the units thereof in any desired position convenient to anoutlet in the residence lighting circuits on residence premises.

A more specific object of the invention is the provision of a methodwhereby radio frequency currents may be transferred from one device toanother by units of low impedance coupling to connect the devices to theresidence lighting conductors.

Another object of the invention is the provision of a system wherein thetuner unit and the amplifier and associated speaker unit of a radioreceiver may be located at remote points with the sole connectionstherebetween comprising the residence lighting conductors to which eachof the units is coupled by low impedance.

A further object of the invention is the provision of a system wherebyswitches and other electrical devices may be remotely controlled withthe use of the residence lighting conductors by the utilization of aunit adapted to superpose upon the alternating current of the residencelighting conductors a control current component, such as, an oscillatorycurrent of a frequency different from that of the frequency of thecurrent in the residence lighting conductors, or a direct currentcomponent, to which another unit will respond.

A still further object of the invention is the provision of such adevice wherein the tuner unit and the'amplifier and associated speakerunit of a radio receiver remotely located are connected together bycoupling each of said units with low impedance coupling to residencelighting conductors and the amplifier circuit switch is operated by adevice responsive to a control current component superposed on thecurrent of the residence lighting conductors by a unit associated withthe remotely located tuner unit.

Other objects of the invention will in part be obvious and will in partappear hereinafter.

The invention accordingly comprises the several steps and the relationof one or more of such steps with respect to each of the others, and

the apparatus embodying features of construction, combination ofelements and arrangement of parts which are. adapted to effect suchsteps, all as exemplified in the following detailed disclosure, and thescope of the invention of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the inventionreference should be had to the following detailed description taken incon nection with the accompanying drawings, in which:

Fig. 1 is a simplified schematic view of the tuner unit and amplifierand speaker unit of a radio receiver remotely located, utilizing theprinciple of the present invention;

Fig. 2 is a diagrammatic view of the circuit of a radio receiverutilizing principles of the present invention;

Fig. 3 is a diagrammatic View of the circuit of a selective energizerutilized in the present invention;

Fig. 4 is a diagrammatic view of the circuit of another type ofselective energizer;

Fig. 5 is a diagrammatic view of the circuit of a selective responderutilized in the present in vention;

Fig. 6 is a diagrammatic view of the circuit of another type ofselective responder; and

Fig. '7 is a diagrammatic view of the circuit of an additional type ofselective responder which may be utilized with the type of selectiveenergizer depicted in Fig. 2.

The present invention involves systems of transferring radio frequencycurrent with the use of residence lighting conductors, for example, thetransfer of such currents from the tuner unit of a radio receiver to theamplifier and speaker unit thereof, and to a method for effecting suchtransfer. This transfer is obtained by connecting the units to theresidence lighting conductor through low impedance coupling. Inaddition, the invention involves the utilization of the residencelighting conductors for remotely controlling devices such as electricalswitches, for example, for operating the circuit switch of the amplifierand associated speaker unit of a radio receiver from a remotely locatedtuner unit. According to the present invention, this involves the use ofa selective energizer for superposing on the residence li htingconductors a control current adapted to operate a remotely locatedselective responder.

Referring to the drawings like numerals denote like parts throughout.The tuner unit of a radio receiver is designated by the numeral [9 whichin Fig. l is shown connected to the usual aerial I! and groundconnection l2. To the plate I3 of a tube, preferably an intermediatefrequency amplifier tube, is shown connected the primary M of anintermediate frequency step down coupling transformer. The secondary 15of the coupling transformer is shown capacitance coupled, preferably bycondensers l6 and H in wires [8 and I9, to the terminals of a plug 20 ofthe usual type adapted to be received in an outlet 25 in the residencelighting circuitdepicted at 22. In between the capacitance coupling andthe plug 22 a selective energizer 23 adapted to supply to the residencelighting conductors a control current is connected by wires 24 and 25 towires I8 and I9.

The amplifier and speaker unit 26 of the radio receiver is provided witha tube, preferably an intermediate frequency amplifier tube, the grid 27of which is connected to the secondary 28 of I an intermediate frequencystep up coupling transformer. The primary 29 is capacitance coupled,preferably through condensers 35 and 3! in wires 32 and 33 to the plug20' adapted to be received in an outlet 2| in the residence lightingcircuit.

Between the capacitance coupling and the plug 26 is connected, by wires34 and 35, a selective responder unit 36 adapted to be operated by thecontrol current generated by the selective energizer 23 to close thecircuit switch 3'! of the amplifier and associated speaker unit 26.

In Fig. 2 is shown the circuit of a radio receiver and associatedapparatus such as that depicted in Fig. 1 utilizing the principles ofthe present invention. The antenna l i is connected toan antennacoupling transformer38 having one side plate 45 is connected to one endof theprimary of an intermediate frequency transformer 49. The other endof the primary is connectedto the Wire 38.

In accordance with principles of super-heterodyne amplification anoscillator tube '50 has its plate 5! connected to the wire through'a'portion of a transformer 52 and its control grid 53 comiected througha grid coupling condenser 5 to one end of the primary of the transformer52.

The other end of the primary is connected to the indirectly heatedcathode 55 of the oscillator tube 59. An oscillator grid leak 56 isconnected across between the grid 53 and cathode '55 and a variabletuning condenser E? is connected across the primary of the transformer32. A wire 58 connected to the wire 52 grounds the oscillating circuit.The frequency of the current supplied bythe oscillator 5i and itsassociated circuit is fed into the cathode 53 of the first detector 40through a coupling 'coil59 of the transformer 52 andthe bias resistor 68with the latter bridged by a by-pass condenser 6i.

An intermediate frequency amplifier tube 62 has its control grid 63connected to one end of the secondary of theintermediate frequencytransformer d9 and'the cathode 64 connected through a bias resistor 85,to the other end of the secondary.v The resistor '65 is by-passed bycondensertt. This grid circuit is grounded by a wire 6'! to the wire 32.The screen grid 68 of the amplifier tube 62 is connected to the wire'Qiiwhich serves as a common conductor to the voltage divider 41. Theplate l3 of the amplifier 62 is connected to one end of the primary M ofthe intermediate frequency step down coupling transformer. The other endof the primary I4 is connected to the wire 48.

Across the secondary [5 of the intermediate frequency couplingtransformer is connected the resistance element of a volume control 69.Sliding contact of the volume control 69 is connected through thecondenser l6, wire I8, and a switch Hi to one of the residence lightingconductors 22. One side of the secondary E5 of the intermediatefrequency coupling transformer is connected through the condenser H andwire l9 to the other residence lighting conductor 22.

, A ballast resistor?! is connected to-the supply wire it. The heaterelements of each of the vacuum tubes 12, 62, 5E! and 46 are connected inseries with each other and with the ballast resistor l I. This filamentsupply circuit is completed by the wire 42 forming a connection betweenone end of the filament of the tube 40 and the supply wire 19.

The plate voltage is supplied by a rectifier tube 12 having aplate 73,connected through the wire 18 and the switch 10 to one of the residencelighting conductors 22, and an indirectly heated cathode 14, connectedthrough the choke coil '15 to the wire 48 to which the plates of thepreviously described vacuum tubes are connected. The plate voltagesupply circuit is completed through the respective vacuum tubes, thecathodes thereof being connected to the wire 42, the latter beingconnected to the other residence lighting conductor 22 through the wirei9. Condensers 16 and i1 are bridged across from the "wire 18 connectedto wire l9 to the indirectly heated cathode 14, one on eachside of thechoke coil 15 to form with the choke coil '15 'a filter circuit.

The switch Hi, for example one of the toggle type, is utilized to openand close the circuit of the above described tuner unit and is shown inthe open position. The selective energizer 23 comprises an operator arm19 connected through a rectifier unit 89 to the wire I9 and carries acontact 8| adapted to make contact with the plate 82 connected to acontact engaged by the arm of the toggle switch In in the open position.

The-end of the switch arm 19 is provided with-' a projection 83adaptedto engage the .end of the toggle switch arm it. The rectifierunit 88 preferably comprises a bank of commercial type rectifiers asshown so that the unit is of ample capacity to cause a unilateralcurrent of suitable frequency coupling transformer as previouslydescribed when the switch 31 is in theclosed position. An intermediatefrequency amplifier tube 84 has its control grid 21 connected to one endof the secondary 28 of the intermediate frequency'coupling transformerand its indirectly heated cathode 85 connected through a bias resistor86 to the other end of the secondary 28,

-with a by-pass condenser 87 bridged across the resistor 85. The plate88 of the amplifier 84 is connected to one end of the primary of anintermediate frequency transformer '89 and the other end of the primaryof the intermediate power transformer I I0.

anode II9 of the full-wave rectifying tube.

frequency transformer is connected to the wire 90 which is the positivecommon conductor of the plate supply. The screen grid 9I of theamplifier 84 is connected to an intermediate tap of a voltage divider 92by means of a wire 93.

A second detector vacuum tube 94 has its grid 95 connected through agrid condenser 96 bridged by a grid leak 91 to one end of the secondaryof the intermediate frequency transformer 89. The indirectly heatedcathode 98 is connected to the other end of the secondary of thetransformer 89 and to the wire 99 which is the negative common conductorof the plate supply. The plate I00 of the detector tube 94 is connectedto one end of the primary of an audio-frequency transformer ml. Theother end of the primary of the transformer IIII is connected to thewire 99. A radio frequency by-pass condenser I92 is connected betweenthe cathode 98 and the plate I09.

One end of the secondary of the audio-frequency transformer IIlI isconnected to the grid I03 of an audio-frequency amplifier tube I34.

The other end of the secondary is connected to the Wire 99 and through abias resistor I05 to the indirectly heated cathode I86 of the amplifiertube I94. The bias resistor I is bridged by a by-pass condenser I 01.The plate I38 of the amplifier tube I04 is connected to one terminal ofthe speaker I09. The other terminal of the speaker I09 is connected tothe wire 90.

A transformer IIB supplies power to the amplifier-speaker unit andconsists of a primary III connected across the supply wires 32 and 33. Asecondary winding H2 in the power transformer IIU supplies current tothe heater elements of the vacuum tubes 84, 94 and I04. An intermediatetap of the secondary Winding H2 is connected to the wire 99. The wire isconnected through a choke coil M3 to an intermediate tap of a secondsecondary H4 in the The secondary II4 is connected across the cathode H5of a full-wave rectifier tube to supply energy for heating the cathode.Condensers H6 and III are bridged across from the wire 99 to either sideof the choke coil I I3 to form with the latter a filter circuit. Eachend of a third secondary winding II8 of the power transformer III] isconnected to an An intermediate tap on the secondary H8 is connected tothe wire 99 which completes the slate voltage supply circuit. Thevoltage divider 92 is connected across the wires 98 and 99.

.The selective energizer 36 is connected to the residence lightingconductors by a wire I23 through a filter circuit consisting of chokecoils I2I and I22 and condensers I23 and I24, and a wire I25 connectedto the other" residence lightingconductor 22. The wire I25 is alsoconnected to a contact I29 of the switch 37 which cooperates with acontact I2I connected to the wire 33 to close the supply circuit of theamplifierspeaker unit. The above described filter circuit suppliescurrent to the coil I28 of a relay which has a fixed contact I29 and amovable contact I30 adapted to be closed when the coil I28 is energized.The contacts I29 and I39 complete another relay circuit through abattery I3I and a relay coil I32. The relay coil 32 adapted to operatethe armature I33 of aratchet relay havinga shaft I34 provided with adisc I35 having a segmented'peripheryv to provide a plurality ofcontacts I21, the spaces between which are filled with insulatingmaterial to provide with the contacts I21 alternate open and closedcircuit positions for the contact I26.

Operation of typical radio receivers incorporating principles of thepresent invention can be readily understood from the operation of thereceiver diagrammatically shown in Fig. 2. The radio currents picked upby the aerial l I are supplied to the tuner unit, tuned by the couplingtransformer 38 and the variable condenser 41 and supplied to the firstdetector vacuum tube 49 through the control grid 39. A tuned circuitconsisting of the secondary of the transformer 52, variable condenser51, grid leak 56, grid condenser 54 and the tube 50 comprises anoscillator. The frequency of the current supplied by the oscillatortransformer 52 differs from that in the antenna coupling transformer 38by the frequency to which the intermediate frequency transformer 49 istuned. This current supplied by the oscillator transformer 52 to thefirst detector tube 40 through the cathode circuit thereof to becombined with the incoming radio currents to raise the wave length ofthe latter in accordance with the principles of the superheterodynereception. The resulting radio current is supplied at the intermediatefrequency amplifier tube 62 through the intermediate frequencytransformer 49 and transferred to the output wires I8 and I9 through theintermediate frequency coupling transformer i4I5 and the condensers I6and IT. The ratio of turns in the coupling transformer is preferablyabout one hundred to one and the condenser I3 is connected to thesecondary I5 through a volume control 69. With the use of theintermediate frequency coupling transformer I4I5 and condensers I6 andH, the tuner unit is low impedance coupled to the residence lightingconductors 2222.

The selective energizer shown at 23 in Fig. 2 is adapted to impose adirect current impulse upon the residence lighting conductors 22-22 andis combined with the tuner circuit supply switch 79 so that the directcurrent impulse may be generated during the time the tuner circuitswitch isbeing turned on. With the tuner circuit switch I9, preferablyof the toggle type, in the off position as shown in full lines, when theoperator arm I9 is rotated counter clockwise contact is made betweencontact 8| and contact 82 allowing current to flow from the wire I3through the rectifier bank 80, operator arm I9, contacts 8| and 82, andthe switch arm ID to the wire I8. The period of flow of direct currentwill be for a relatively short time since as the operator arm I9 isfurther rotated the toggle switch If! is swung over to break this directcurrent generating circuit and close the tuner supply circuit.

When the amplifier speaker unit switch 3'! is closed the intermediatefrequency current passes through conductors 32 and 33 which are lowimpedance coupled to the amplifier unit through condensers 3i and 32 andthe intermediate frequency step up coupling transformer 2928. Theintermediate frequency current is supplied to the intermediate frequencyamplifier tube through its grid 2! from the secondary 29 thereinamplified. The amplified current is supplied from the plate circuit ofthe amplifier tube 84 through the intermediate frequency couplingtransformer 89 to the grid of the second detector tube 94. The resultantdetected radio current is then supplied from the plate circuit of thedetector tube 94 to the audio-frequency transformer IUI and theaudio-frequency amplifier-tube I04 to' be translatedinto sound grid coilI05.

'ture co-ntactl55 and the fixed contact I53.

by the speaker I09.

The switch 31 for the amplifier-speaker unit is operated by the directcurrent impulse imposed upon the alternating current of the residencelighting conductors 22-22 through operation of the selective respondercontrol unit-36 in which thefilter circuit chokes out the alternatingcurrent, allowing the direct current-impulse tobuild up a-magnetic-fieldabout the relay coil I surficient to close the contacts I 20 and I tocause the relay I32 to be energized from the battery'IBI.

The resultant magnetic field about relay I32 causes the armature I33 torotate the ratchet'one notch causing the contact I25 to make contact'with'a contact segment I21 there-by closingthe amplifying supplycircuit. The switch 31is turned off in a similar manner by the nextdirect current impulse superposed on the alternating current of theresidence-lighting conductors 22 when the operator arm 19 of theselective energizer 23 is rotated in a clockwise direction to turn thetuner switch 70 to an off position. Athyralocated energizer as. well asby the direct current impulse method outlined above.

Briefiy this method comprises the use of means for superposing onalternating current ordirect curr-entof the residence lightingconductors a current of difierent frequency which will operatealswitchoperating device.

In Fig. 3 the circuit of theoscillatoris depicted coupled to supplywires I8 and I9 throughzthe tuner switch depicted and previouslydescribed. An oscillator tube I55 has its'filanient I31 supplied withcurrent thr'ough'the wires I38I35 and I39 connected respectivelyto'supply wires I8 and I0. A ballast resistor I40 in series with thefilament I31 and the wires I38 and I35 complete the-filament circuit.The plate II of the oscillator tube I36 is connectedthr ough a coil M2of a transformer to the wire I38. The grid I 43 of the oscillator tubeI35 is connected through a grid condenser I45 and a coil I45 of thetransformer to'the wire I58. A'grid leak I 46 is connected between. thegrid M3 and the wire I38 and a variable condenser Mlis bridged acrossthe The resultant oscillator circuit is coupled to the supply wires I8.andIQ through a coupling coil I46 and condensers I69 and 550. Thisoscillator circuit is tuned to superpose upon the residence lightingconductors 2222.an alterhating current of a frequency different fromthat of the current of the residence lighting conductors when the tunerswitch is operated. This requirement is to be satisfied whether thecurrent in the residence lighting conductors is alternating or direct,in the latter case the frequency being zero.

In Fig. 4 is shown a buzzer coil method of su- Lperposing an oscillatorycontrol current upon the current of residence lighting conductors 22-42.A wire I5I connected to supply wire I36 and a wire I52 connected tosupply wire I0 cooperate 'with a fixed buzzer contact I53 and anarmature contact I54 to energize the buzzer coil I55. A couplingcondenser I and a coil I51 of a transformer are connected in seriesacross the arma- The coupling coil I03 cooperates with condensers I49and I 50-as in- Fig. 3 I to impress oscillatory control lfilland IN.

currents uponthe current of theresidence'lighting conductors 22-42whenthe tunerswitch is operated.

In Fig. 5 is shown the circuit of a selective responder unit adaptedremotely to operate an amplifier switch with selective energizers of.the types depicted-in Figs. 3-and4. Between the wiresI20 andl25 isconnected abridged circuit having input terminals I58v and 159 andoutputterminals Preferably, between theinput terminal I59 and theoutputterminals I60 and I6I are connected respectively resistances I62 andI63, and between the input terminal 158 and output terminal I60 isconnected a condenser I64 and between the input terminal I58 and outputterminal IISI is connected an inductance I65. This bridge circuit isbalanced so that at the frequency of the normal alternating current ofthe residence lighting conductors there is no potential differencebetween the output terminals I60 and Thus oscillatory currents ofdifierent, for example, higher frequency in the residence lightingconductors supplied thereto by selective energizers of the typesdepictedin Figs. 3. and 4 will cause a potential differenceto 'be formed betweenthe output terminalslfifi and I6! due to the fact that inductivereactance and capacitive reactance vary inversely when the frequency isvaried. This condition will cause a current to fiow through the relaycoil I28 to close the circuit of the switch operating ratchet relay.

Obviously different arrangements of the resistances I62 and I63,condenser I64, and inductance I65 canbe made to obtain similar resultsin accordance with the present invention. For example, the resistanceI62 andlthe inductance I65 can be substituted. for each .other in thebridge circuit and by using variable resistances the bridgecan bereadily balanced so that there .is

no potential difference between theoutputterminals I60 and I6! at thefrequency of the normal current in the residence lighting conductors.However, the arrangement shown in Fig. .5 is .preferredsince a maximumcurrent fiow through the relay coil I28 can thus beobtained.

In Fig. 6 is shown the circuit of another typeof selective respondertobe used'with selectiveenergizers'of the types depicted-in Figs. 3 and 4.The supply wires I20 and I 25 are coupled through condensers I66 and I61and the transformer I68 to a rectifier bridge circuit having inputterminals I69 and I10 and output terminals III and I12. Across the inputterminals I69 and I10 is connected a variable condenser I13. Thisrectifier bridge circuit is of the well known type having direct currentmethod. An inductance 0011' I18 is connected across the supply wires I20and I25 and is provided with an iron 'core Nil-which is saturated withmagnetic flux at the frequency of the normal alternating current of theresidence lighting conductors so that any additional current such as adirect current component will cause a-large increase of current'to'fiow,due to'oversaturation in core I19. This increase in current flowingthrough the relay coil I28 is suflicient to close the circuit of theratchet-relay.

It will thus be seen that the present invention e'fiiciently attains theobjects set forth above and provides means for utilizing the residencelighting conductors for transferring radio frequency currents from tunerunits to remotely located amplifier and associated speaker units and foroperating amplifier circuitswitches from remotely located tunerswitches.

' Since certain changes may be made in the above construction anddifierent embodiments of the invention could be made without departingfrom the scope, for example, in the direct current method of controllinga remotely located electrical device such as a switch, a continuous control current may be used in lieu of an impulse, it is intended that allmatter contained in the above description or shown in the accompanyingdrawings shall be interpreted as illustrative and not in alimitingsense.

Having described our invention, what we claim as new and desire tosecure by Letters Patent, is:

1. In a device for the remote control of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors, a tuner unit, low impedance coupling connectingsaid tuner unit to the residence lighting conductors, an amplifier andassociated speaker unit, low impedance coupling connecting saidamplifier and associated speaker unit to the residence lightingconductors, of a switch between one side of the circuit of saidamplifier and speaker unit and one of said residence lightingconductors, a selective responder unit connected to the residencelighting conductors and associated with said switch mechanically tooperate the same, and a selective energizer connected to the residencelighting conductors re mote from said selective responder unit forsupplying a control current to said residence lighting conductors to becarried thereby to said selective responder unit for initiatingoperation thereof.

2. In a device for the remote control of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors, a tuner unit, low impedance coupling connectingsaid tuner unit to the residence lighting conductors, an amplifier andassociated speaker unit, low impedance coupling connecting saidamplifier and associated speaker unit to the residence lightingconductors, of a switch in said amplifier and speaker unit between oneside of the circuit of said amplifier and speaker unit and one of saidresidence lighting conductors, a selective responder unit in saidamplifier and speaker unit connected to the residence lightingconductors and associated with said switch mechanically to operate thesame, and a selective energizer in said tuner unit connected to theresidence lighting conductors for supplying a control current to saidresidence lighting conductors to be carried thereby to said selectiveresponder unit for initiating l operation thereof.

3. A remote control device for operating a circuit switch comprising thecombination with residence lighting conductors carrying alternatingcurrent and a switch between one side of the circuit of an electricaldevice and one of said residence lighting conductors, of a selectiveenergizer comprising means located remotely from said electrical deviceand connected to the residence lighting conductors to superpose a directcontrol current upon the alternating current in the latter, and aselective responder unit connected to the residence lighting conductorsand associated with said switch mechanically to operate the same, saidunit being adapted to respond to the direct control current superposedon the alternating current of the residence lighting conductors.

4. In a device for the remote control of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors carrying alternating current of a selectiveenergizer connected to the residence lighting conductors comprisingmeans to superpose a direct control current upon the alternating currentin the latter, a switch between one of said residence lightingconductors and one side of the circuit of said amplifier and associatedspeaker unit located remotely from said energizer, and a selectiveresponder unit associated with said switch comprising means mechanicallyto operate said switch and means connected to the residence lightingconductors responsive to the direct control current to initiateoperation of said switch operating means.

5. A remote control device for operating a circuit switch comprising thecombination with residence lighting conductors carrying alternatingcurrent and a switch between one side of the circuit of an electricaldevice and one of said residence lighting conductors, of a selectiveenergizer comprising means located remotely from said electrical deviceand connected to the residence lighting conductors to superpose a directcontrol current upon the alternating current in the latter, and aselective responder unit associated with said switch comprising meansmechanically to operate the switch and means responsive to the directcontrol current superposed upon the alternating current of the residencelighting conductors connected to the latter adapted to initiateoperation of said switch operating means.

6. In a device for the remote control of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors carrying alternating current and a tuner circuitswitch, of means connected to said residence lighting cond ctors andphysically associated with the tuner circuit switch to be operatedmechanically by the action necessary to close said switch to superpose adirect control current upon the alternating current of the residencelighting conductors, a switch between one side of the circuit of saidamplifier and associated speaker unit and one of said residence lightingconductors, means mechanically to operate the latter switch, and meansconnected to said residence lighting conductors responsive to the directcontrol current superposed on the alternating current of the residencelighting conductors adapted to initiate operation of said switchoperating means.

7. In a device for the remote control of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors carrying alternating current, a tuner circuit switchconnected to the residence lighting conductors and an amplifier switchconnected to the residence lighting conductors, of rectifying meansphysically associated with the tuner circuit switch connected across theresidence lighting conductors by the action necessary to close saidtuner circuit switch to superpose a direct control current upon thealternating current of the residence lighting conductors, means tooperate the amplifier circuit switch, and means responsive to the directcontrol current superposed on the alternating current of the residencelighting conductors adapted to initiate operation of the amplifierswitch operating means.

8. In a device for the remote control of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors carrying alternating current, a tuner circuit switchconnected to the residence lighting conductors and an amplifier switchconnected to the residence lighting conductors, of rectifying meansphysically associated with the tuner circuit switch connected across theresidence lighting conductors by the action necessary to closesaidtun-er circuit switch to superpose a direct control current upon thealternating current of residence lighting conductors, means to operatethe amplifier circuit switch, a filter circuit connected to theresidence lighting conductors adapted to choke out the alternatingcurrent component while passing the direct current component, and meansresponsive to the direct con trol current" connected to said filtercircuit adapted to initiate operation of said amplifier switch operatingmeans.

9. In a device for the remote control of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors carrying current, a tuner unit low impedance coupledto the residence lighting conductors, an amplifier unit low impedancecoupled to the lighting conductors, a switch in the power supply circuitof said tuner unit, a switch'in the power supply circuit of saidamplifier unit, of a selective energizer associated with said tunerswitch and comprising means connected across the residence lightingconductors by the action necessary to close said tuner circuit switch tosuperpose on the current in the latter a control current, and aselective responder unit physically associated with said amplifierswitch mechanically to operate the latter and connected to the residencelighting conductors to be operated by thesuperposed control current.

10. In a device for the remote control'of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors carrying alternating current, a tuner unitlowimpedance coupled to the residence lighting conductors, an amplifierunit low impedance coupled to the residence lighting conductors, aswitch in the power supply circuit of said tuner unit, a switch in thepower supply circuit of said amplifierunit, of a rectifier unitphysically associated with the tuner circuit switch connected across theresidence lighting conductors by the action necessary to close saidtuner circuit switch to superpose a direct control current upon thealternating current of the residence lighting con rductors,,means tooperate said amplifier circuit switch, a filter circuit connected to theresidence lighting conductors adapted to deliver the direct controlcurrent, and means connected to said filter circuit adapted to respondto the direct control current and. initiate operation of said amplifiercircuit switch operating means.

11. In a remote control device the combination with conductors carryingalternating current of normal commercial frequencies of a selectiveenergizer adapted to superpose on the alternating current of theconductors an oscillatory control current, and a selective responderadapted to respond to the oscillatory control current, said selectiveresponder comprising a bridge circuit having four arms, a pair of inputterminals and and anoutput terminal in the third arm and an inductanceconnected between an input terminal and an output terminal in the fourtharm, said bridge circuit being balanced so that the output terminals areat the same potential at the frequency of the normal alternating currentof the conductors.

12. In a remote control device the combination; .with conductorscarrying'alternating current of normal commercial frequencies, of aselective energizer adapted to superpose on the alternate ing current ofthe conductors an oscillatory'current of different frequency, a:selective responder comprising abridge circuit having input terminalsconnected. to the conductors and output terminals adapted to supplycontrol current, equal resistance units connected between one inputterminal and the two output terminals,,a capacity unit connected betweenthe other input terminal and an output terminal and an inductanceconnected between the latter input terminal and the other outputterminal, said bridge circuit being balanced so that-the outputterminals are at the same potential at the frequency of the normalcurrent of the conductors.

13. In a device for the remote control of an amplifier and associatedspeaker unit of a radio receiver, the combination with residencelighting conductors-carrying alternating current and a remote tuner unitof a selective energizer at the tuner unit connected to the residencelighting conductors to superpose on the alternating current thereof analternating current of higher frequency, a switch to open and close theamplifier circuit, and a selective responder having means to operatesaid switch, said selective responder comprising a bridge circuit havinginput terminals connected to the conductors and output terminals adaptedto supply control current to the switch operating means, equalresistance units connected between one input terminal and the outputterminals, a capacity unit connected between the other input terminaland an output terminal and an inductance connected between the latterinput terminal and the other output terminal, said bridgecircuit beingbalanced so that the output terminals are at the same potential at thefrequency of the normal alternating current of the conductors.

14. In a remote control device the combination with residence lightingconductors carrying alternating current of normal commercialfrequencies, of a selective energizer adapted to superpose on thealternating current of the conductors a direct current component, and aselective responder comprising an iron core inductance connected into acircuit across the residence lighting conductors, the core of which issaturated with-magnetic flux .at the normal frequency of the residencelighting conductors'so that the direct'current component will cause anover-saturation resulting in an increase in the current flow, saidincrease in the current fiow being adapted to operate a control device.

HENRY ROGERS MALLORY; SAMUEL RUBEN.

